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YuhangZhao - 01:22, Thursday 16 January 2020 (1968)Get code to link to this report
Replacement of lens for homodyne

We received the super-polished lens from CVI with 30mm focal length. With this super-polished lens we should have less parasitic interference.

So we compared the back scattering and squeezing level.

As shown in the attached figure, there are some difference at low frequency which is more back scattering(worse) and more squeezing(better). 

Actually the low frequency part, we have already ovserved some uncertainty during different measurment. So it seems the replacement of lens doesn't improve system obviously.

Images attached to this report
1968_20200115172217_bs.png 1968_20200115172223_sqz.png
Comments related to this report
EleonoraCapocasa - 11:12, Thursday 16 January 2020 (1969)

The measurment in the first picure is done when the back reflected light towords the squeezing path is blocked with a sensor card.